The conserved AU dinucleotide at the 5' end of nascent U1 snRNA is optimized for the interaction with nuclear cap-binding-complex.

The conserved AU dinucleotide at the 5' end of nascent U1 snRNA is optimized for the interaction with nuclear cap-binding-complex.
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DOI:
10.1093/nar/gkx608
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发表时间:
2017-09-19
影响因子:
14.9
通讯作者:
Chang TH
Chang TH
中科院分区:
生物学2区
文献类型:
--
作者:
Yeh CS;Chang SL;Chen JH;Wang HK;Chou YC;Wang CH;Huang SH;Larson A;Pleiss JA;Chang WH;Chang TH

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剪接是由Pre-mRNA和U1 SnRNP之间的生产性相互作用启动的,在Pre-mRNA的5‘剪接位点和U1 SnRNA的5’端之间建立了一个短的RNA双链。一个长期存在的谜题是,为什么U1SnRNA 5‘端的AU二核苷酸高度保守,尽管在双链的形成中没有明显的作用。为了探索这个难题,我们将AU二核苷酸改变为所有可能的排列,并分析了由此产生的分子后果。这导致了意想不到的发现,即AU二核苷酸决定了帽结合复合体(CBC)与新生U1 SnRNA的5‘端的最佳结合,这最终影响了U1 SnRNP在剪接中的利用。我们的数据还提供了一种结构解释,解释为什么AU二核苷酸在进化过程中是保守的。
Splicing is initiated by a productive interaction between the pre-mRNA and the U1 snRNP, in which a short RNA duplex is established between the 5′ splice site of a pre-mRNA and the 5′ end of the U1 snRNA. A long-standing puzzle has been why the AU dincucleotide at the 5′-end of the U1 snRNA is highly conserved, despite the absence of an apparent role in the formation of the duplex. To explore this conundrum, we varied this AU dinucleotide into all possible permutations and analyzed the resulting molecular consequences. This led to the unexpected findings that the AU dinucleotide dictates the optimal binding of cap-binding complex (CBC) to the 5′ end of the nascent U1 snRNA, which ultimately influences the utilization of U1 snRNP in splicing. Our data also provide a structural interpretation as to why the AU dinucleotide is conserved during evolution.
DOI: 10.1038/nature21079
发表时间: 2017-02-16
期刊: NATURE
影响因子: 64.8
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